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[pyrre]

Will some of these UV roms fit the purpose of writing kickstartfile to it and replace the kickstart chips in A1200?

[Doobrey]

Nope, those 27c010/020 are only 8 bit chips.
You need a pair of 27c200 (128k*16 bit) for the A1200.

27c400's can be used too.. either as a 1MB ROM, or just burn the image into it twice and use as a 512KB ROM.

[alexh]

You can also use 27C160 ones too, they are less friendly as you must bend two pins and solder them (to VCC or GND perhaps via switches) but they are more readily available, they can hold multiple kickstarts, but are slightly more expensive.

[Doobrey]

It's times like this I really wish I could mention a project by another Amiga.org member
(unsubtle hint: pin compatible and a lot easier that faffing about with UV erasing ;-) )
Hopefully it won't be long before there's some news.

[lopos]

Doobrey wrote:
It's times like this I really wish I could mention a project by another Amiga.org member
(unsubtle hint: pin compatible and a lot easier that faffing about with UV erasing ;-) )
Hopefully it won't be long before there's some news.

Tell us a bit more about that secret project. :violin:

[Hodgkinson]

Oooh, I just had a idea.

If you get ROMs/EPROMS that are much larger than what is required, then what you could do is connect all of the amiga address lines to the ROM address lines, except displaced by one or two address pins (Eg, A0 goes to A2, A1 to A3 etc, providing that this *larger* chip as two more address lines - In this example - Than the standard ROMs). This way, suppose you displaced the addresses by two pins, then you could have 4 different kickstarts programmed into the ROM / EPROM, selectable by applying voltages to the first two address pins.

This way, the 4 kickstarts would have there code staggered every fourth memory location (With a address pin dispalacement of 2).

One problem: I dont have a programmer. The largest amount of code I have ever programmed into a EPROM is 16 addresses, manually, using DIP switches on a protoboard. This EPROM is used as a LUT in a RC remote control converter. :-D

Hodgkinson.

[hardlink]

Doobrey wrote:
27c400's can be used too.. either as a 1MB ROM, or just burn the image into it twice and use as a 512KB ROM.

In 1994, Kickstart chips in my A4000D were ceramic body EPROMS with the UV window, programmed of course with KS 3.0, and may have been 27C400's. Made it real easy to upgrade to 3.1

I have no idea why Commodore, already losing money, used IC's that were probably 10 times more expensive than the usual ROMs.